Improvement in friction supporting stays

Description

[0001] The invention relates to friction supporting stays, for windows, of the kind comprising a track, a slider movable along the track, a strut pivotally connected to the track, a brace pivotally connected between the slider and the strut, a link pivotally connected to the slider, and a bar pivotally connected to the link and to the strut, the arrangement being such that as the slider moves along the track the bar can swing from a position overlying the track to a position where it is angled with respect to the track.

[0002] In use, two such supporting stays are normally provided at opposite sides of a window, the track of each stay being mounted on the window frame and the bar being mounted on the window sash. The arrangement is such that as the window pivots on the stays, about either a vertical or a horizontal axis, the axis of pivoting of the window sash moves away from the window frame so that when the window is open both sides thereof are accessible from one side of the window frame.

[0003] The window sash is frictionally restrained in any angular position to which it is set. This frictional restraint may be provided partly by the friction at the pivotal connections between the various elements but is largely provided by the frictional engagement between the slider and the track.

[0004] In friction supporting stays of this kind, the end of the track remote from the strut is normally provided with a cap member providing two internal cam surfaces meeting at an apex, and the end of the bar which overlies the track when the stay is in the closed position is provided with a correspondingly shaped nose portion which enters the cap member and engages the cam surfaces with a wedging action as the stay is moved into the closed position.

[0005] Normally, the shape of the cap member and the shape of the nose portion are symmetrical so that the stay may be opened in either direction from the closed position. Applicants own specification GB-A-2081804 shows a friction supporting stay or hinge of the type described above in which the shape of the nose portion at the end of the bar and the cam surfaces of the cap member at the end of the track are symmetrical and in the form of an obtuse angle.

[0006] Such symmetrical nose cap hinges or stays have been used for some years and have proved reasonably satisfactory. However, in stays above a certain size, for use with large windows, there is inevitably some deflection of the components of the stay due to the weight of the window and it is sometimes found that, due to this deflection, the nose portion on the bar becomes displaced from its designed path of movement as the window is closed so that it does not enter the cap member and engage the cam surfaces but instead strikes the outer surface of the cap member. The present invention provides a modified shape of cap member and nose portion in such a stay to overcome this problem and thus render the stay suitable for use in large sizes and with heavy windows.

[0007] According to the invention, in a friction stay of the kind last referred to, the internal cam surfaces on the cap member are asymmetrically disposed with respect to the central longitudinal axis of the track, one cam surface being at a greater angle to the axis than the other, the corresponding surfaces on the nose portion of the bar being correspondingly inclined.

[0008] Preferably the apex between the two inclined cam surfaces on the cap member is displaced to one side of the central longitudinal axis of the track, so that the surface inclined at a greater angle to the axis intersects the axis.

[0009] Preferably one of said cam surfaces is so disposed as to prevent movement of the bar past the track in one direction. For example, said surface may extend substantially parallel to the central longitudinal axis of the track. This means that the window on which the stay is fitted can then only be opened and closed to one side of the stay.

[0010] In friction stays of the kind first referred to, the strut is usually pivotally connected to the track by means of a rivet, and in the case where the track is channel-sectioned the web of the channel section may be domed upwardly where the rivet passes through it to provide a support for the end of the strut just above the side walls of the channel section. A disadvantage of this arrangement is that the metal of the web of the track is fairly thin and therefore engages only a short length of the shank of the rivet, providing little support against tilting of the rivet. With continued use of the stay, therefore, the metal of the track tends to become worn and/or deformed and the rivet becomes loose leading to inaccuracy in operation of the stay. The present invention therefore also provides a mounting arrangement forthe strut on the track by using a block mounted on the track (see GB-A-2081804) which overcomes this disadvantage.

[0011] According to a preferred embodiment of the invention, the strut is pivotally mounted on a block which is secured to the track. The block, which may be formed from plastics, may be secured to the track by the same rivet which also pivotally connects the strut to the block. Alternatively or additionally the block may be secured to the track by further securing means.

[0012] In the case where the track is in the form of a channel having inturned flanges along the extremities of the side walls thereof, the block may be shaped to be located within said channel and formed with longitudinal recesses to receive said flanges.

[0013] Preferably the block has a surface portion which projects above the surface of the track to provide a bearing surface to prevent components of the stay, particularly the strut and brace, from binding against the track itself. Preferably the block extends along a substantial length of the track beyond the area of the pivot between the strut and the track.

[0014] The following is a detailed description of an embodiment of the invention, by way of example, reference being made to the accompanying drawings in which:

Figure 1 is a plan view of a supporting stay according to the invention, shown in a partly open position, and

Figure 2 is a section, on an enlarged scale, through one of the pivot joints between two components of the stay.

[0015] Referring to Figure 1, the supporting stay comprises a channel-sectioned track member 10 having longitudinal inturned flanges 11. The track member is, in use of the stay, normally secured vertically to the window frame, two stays being provided at opposite sides respectively of the window frame. Fixing holes 12 are provided in the. web 13 of the track member to receive fixing screws. At its upper end the track member is closed by a plastics shaped cap member 14 which is plugged into the end of the track member and may be staked to the track member by deforming a part of the web, or secured by means of a rivet.

[0016] A slider 15 is slidable along the track member and is provided with longitudinal grooves to receive the flanges 11 of the track member. Thus the slider must be introduced into the track member before the cap member 14 is fitted.

[0017] An elongate cranked metal strut 16 is pivotally connected to the track member 10 by a rivet 17 which passes through an elongate plastics block 31 which is of similar cross-sectional shape to the slider 15 and is received within the channel of the track member, having longitudinal grooves to receive the flanges 11. The rivet 17 may pass through both the block 31 and the web 13 of the track member or it may pass only through the block 31, the block being secured to the track member by other means, for example by means of rivets 32.

[0018] An elongate brace 18 is pivotally connected at one end, by a rivet 19, to the slider 15 and at the opposite end thereof, by a rivet 20, to a part of the strut 16 intermediate the ends thereof. The strut 16 has a longitudinal channel 33, of curved cross- section, deformed out of the surface thereof to increase the rigidity of the strut.

[0019] A short link 21 is pivotally connected to the slider 15 by a rivet 22 at a location spaced from the rivet 19. The opposite end of the link 21 is pivotally connected by a rivet 23 to one end of a bar 24, which is in turn pivotally connected, intermediate its ends, by a rivet 25 to the extremity of the strut 16. A cross-link 26, shown in chain lines, may be pivotally connected between the brace 18 and the bar 24, parallel to the strut 16, if required.

[0020] The bar 24, is, in use, connected to the side member of the window sash frame and fixing holes 27 are provided for this purpose.

[0021] In operation, the bar 24 may be swung from the angled position shown in Figure 1, in which the window is open, to a closed position where the bar 24 overlies the track member 10 and the window is closed. The dimensions of the elements of the stay, and the positions of the rivets, are so chosen that the strut 16, brace 18 and link 21 also overlie the track member 10 when the window is in a closed position.

[0022] The upper end of the bar 24 has mounted thereon, by means of the rivet 23 and a further rivet 34, a nose member 35 which cooperates with the cap member 14 as the window is closed.

[0023] The cap member 14 is provided with two internal surfaces 36 and 37 which meet at an apex 38 which is displaced to one side of the central longitudinal axis of the track member 10. The surface 36 extends generally parallel to said axis and the surface 37 is inclined so as to intersect the axis. The nose member 35 on the bar 24 is formed with correspondingly shaped surfaces 39 and 40.

[0024] As the bar 24 moves to the closed position, the inclined surface 40 on the nose member 35 engages the inclined surface 37 on the cap 14 with a wedging action, bringing the surface 39 into abutting engagement with the surface 36. The surface 39 is formed in a rebate in the nose member 35 to permit the bar 24 to overlie the track. It will be seen that engagement between the surfaces 39 and 36 prevents the stay being opened to the left hand side of the track member 10, as viewed in Figure 1. The asymmetric arrangement of the nose member 35 and cap member 14 ensures that the nose member enters the angle in the cap member even though the elements of the stay may be deflected due to the weight of a window mounted on the bar 24. As previously explained, in conventional friction stays the nose portion on the upper end of the bar 24 is so shaped that if the elements of the stay become deflected it is possible for the nose portion to strike the outer right hand side of the cap 14 and thus prevent the nose portion entering the cap.

[0025] It will be seen that since the slider 15 and block 31 each have portions thereof overlying the flanges 11 of the track member, they serve to prevent the elements of the stay, particularly the link 21, brace 18 and strut 16, from binding against the flanges of the track member, which might otherwise happen due to deflection of the stay elements under the weight of the window.

[0026] Any suitable form of pivotal connection may be employed between the elements of the stay, but Figure 2 shows a preferred arrangement where a plastics bush 14 encircles the shank of the rivet 42 and is provided with an outwardly projecting peripheral flange 43 to separate the two components of the stay. It will be seen that the holes through the stay components are counterbored to receive the head and tail respectively of the rivet. The provision of the plastics bush around the rivet reduces metal-to-metal contact and thus reduces wear of the holes in the stay components which might otherwise lead to loosening of the pivotal connections and inaccurate operation of the stay.

Claims

1. A friction supporting stay comprising a track (10), a slider (15) movable along the track (10), a strut (16) pivotally connected to the track (10), a brace (18) pivotally connected between the slider and the strut, a link (21) pivotally connected to the slider (15), and a bar (24) pivotally connected to the link and to the strut, the arrangement being such that as the slider (15) moves along the track (10) the bar (24) can swing from a position overlying the track (10) to a position where it is angled with respect to the track (10), the end of the track remote from the strut being provided with a cap member (14) embodying two internal cam surfaces meeting at an apex, and the end of the bar which overlies the track when the stay is in the closed position being provided with a correspondingly shaped nose portion (35) which enters the cap member (14) and engages the cam surfaces with a wedging action as the stay is moved in the closed position, characterised by the internal cam surfaces (36, 37) on the cap member (14) being asymmetrically disposed with respect to the central longitudinal axis of the track (10), one cam surface (37) being at a greater angle to the axis than the other (36), the corresponding surfaces (39, 40) on the nose portion (35) of the bar (24) being correspondingly inclined.

2. Friction supporting stay according to claim 1, characterised in that the apex (38) between the two inclined cam surfaces (36, 37) on the cap member (14) is displaced to one side of the central longitudinal axis of the track (10), so that the surface (37) inclined at a greater angle to the axis intersects the axis.

3. Friction supporting stay according to claim 1 or claim 2 characterized in that one of said cam surfaces (36) is so disposed as to prevent movement of the bar (24) past the track (10) in one direction.

4. Friction supporting stay according to claim 3 characterised in that said one of said cam surfaces (36) extends substantially parallel to the central longitudinal axis of the track (10) so that the window on which the stay is fitted can only be opened and closed to one side of the stay.

5. Friction stay according to any of claims 1 to 4 characterised in that the strut (16) is pivotally mounted on a block (31) which is secured to the track (10).

6. Friction stay according to claim 5 characterised in that the block (31) is secured to the track (10) by the same rivet (17) which pivotally connects the strut (16) to the block (31).

7. Friction stay according to claim 5 or claim 6 characterised in that the track (10) is in the form of a channel having inturned flanges (11) along the extremities of the side walls thereof, the block (31) being shaped to be located within said channel and formed with longitudinal recesses to receive said flanges (11).

8. Friction stay according to any of claims 5 to 8 characterised in that the block (31) has a surface portion which projects above the surface of the track to provide a bearing surface to prevent components of the stay from binding against the track (10) itself.

9. Friction stay according to any of claims 5 to 8 characterised in that the block (31) extends along a substantial length of the track beyond the area of the pivot (17) between the strut (16) and the track (10).

Ansprüche

1. Reibungsbeschlag mit einer Schiene (10), einem Schieber (15), der längs der Schiene (10) bewegbar ist, einer Strebe (16), die mit der Schiene (10) drehbar verbunden ist, einer Stütze (18), die zwischen dem Schieber und der Strebe drehbar befestigt ist, einer Verbindungsstange (21), die mit dem Schieber (15) drehbar verbunden ist, sowie einem Stab (24), der mit der Verbindungsstange und der Strebe drehbar verbunden ist, wobei der Aufbau so erfolgt, daß dann, wenn sich der Schieber (15) längs der Schiene (10) bewegt, der Stab (24) aus einer Stellung, in der er über der Schiene (10) liegt, in eine Stellung verschwenkt werden kann, in der er zur Schiene (10) geneigt ist, wobei das Ende der Schiene das von der Strebe entfernt ist, mit einem Kappenteil (14) versehen ist, der zwei innere Nockenflächen besitzt, die sich an einem Scheitelpunkt treffen, wobei das Ende des Stabs, das über der Schiene liegt, wenn sich der Beschlag in der geschlossenen Stellung befindet, mit einem entsprechend geformten Nasenteil (35) versehen ist, der in den Kappenteil (14) eindringt und in die Nockenflächen mit einer Keilwirkung eingreift, wenn der Beschlag in die geschlossene Stellung bewegt wird, dadurch gekennzeichnet, daß die inneren Nockenflächen (36, 37) auf dem Kappenteil (14) im Hinblick auf die Mittellängsachse der Schiene (10) asymmetrisch angeordnet sind, wobei eine Nockenfläche (37) zur Achse unter einem größeren Winkel als die andere Nockenfläche (36) geneigt ist, wobei die entsprechenden Flächen (39, 40) auf dem Nasenteil (35) des Stabs (24) entsprechend geneigt sind.

2. Reibungsbeschlag gemäß Anspruch 1, dadurch gekennzeichnet, daß der Scheitelpunkt (38) zwischen den beiden geneigten Nockenflächen (36, 37) auf dem Kappenteil (14) zu einer Seite der Mittellängsachse der Schiene (10) verschoben ist, so daß die Fläche (37), die unter einem größeren Winkel zur Achse geneigt ist, die Achse schneidet.

3. Reibungsbeschlag gemäß Anspruch 1 oder 2, dadurch gekennzeichnet, daß eine der Nockenflächen (36) so angeordnet ist, daß eine Bewegung des Stabs (24) über die Schiene (10) hinaus in eine Richtung verhindert wird.

4. Reibungsbeschlag gemäß Anspruch 3, dadurch gekennzeichnet, daß eine der Nockenflächen (36) im wesentlichen parallel zur Mittellängsachse der Schiene (10) verläuft, so daß das Fenster, auf dem der Beschlag angebracht ist, nur auf eine Seite des Beschlags geöffnet und geschlossen werden kann.

5. Reibungsbeschlag gemäß jedem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß die Strebe (16) auf einem Block (31) drehbar befestigt ist, der an der Schiene (10) angebracht ist.

6. Reibungsbeschlag gemäß Anspruch 5, dadurch gekennzeichnet, daß der Block (31) an der Schiene (10) mit der selben Niete (17) befestigt ist, die die Strebe (16) mit dem Block (31) drehbar verbindet.

7. Reibungsbeschlag gemäß Anspruch 5 oder 6, dadurch gekennzeichnet, daß die Schiene (10) kanalförmig ausgebildet ist und nach innen gekehrte Flansche (11) längs den äußeren Enden ihrer Seitenwand besitzt, wobei der Block (31) so geformt ist, daß er in dem Kanal angeordnet werden kann und mit Längsausnehmungen versehen ist, um die Flansche (11) aufzunehmen.

8. Reibungsbeschlag gemäß jedem der Ansprüche 5 bis 8, dadurch gekennzeichnet, daß der Block (31) einen Oberflächenteil besitzt, der über die Fläche der Schiene vorspringt, um eine Auflagefläche zu liefern, um die Bauteile des Beschlags daran zu hindern, an der Schiene (10) zu blockieren.

9. Reibungsbeschlag gemäß jedem der Ansprüche 5 bis 8, dadurch gekennzeichnet, daß sich der Block (31) über eine beträchtliche Länge der Schiene über den Bereich des Drehpunkts (17) zwischen der Strebe (16) und der Schiene (10) erstreckt.

Revendications

1. Dispositif de support à friction comportant une glissière de guidage (10), un coulisseau (15) déplaçable le long de la glissière (10), une contre-fiche (16) raccordée, de façon à pouvoir pivoter, à la glissière de guidage (10), une jambe de force (18) raccordée, de façon à pouvoir pivoter, entre le coulisseau et la contre-fiche, un élément de liaison (21) raccordé, de façon à pouvoir pivoter, au coulisseau (15), et une barre (24), raccordée de façon à pouvoir pivoter, à l'élément de liaison et à la contre-fiche, l'agencement étant tel que, lorsque le coulisseau (15) se déplace le long de la glissière de guidage (10), la barre (24) peut pivoter depuis une position dans laquelle elle recouvre la glissière de guidage (10) jusque dans une position dans laquelle elle fait un angle par rapport à la glissière de guidage (10), l'extrémité de la glissière de guidage, distante de la contre-fiche, étant munie d'un organe formant capuchon (14) présentant deux surfaces internes en forme de cames se rejoignant au niveau d'une pointe, et l'extrémité de la barre, qui recouvre la glissière de guidage lorsque le dispositif de support est dans la position fermée, étant munie d'une partie (35) constituant un nez de forme correspondante, qui pénètre dans l'organe formant capuchon (14) et contacte les surfaces en forme de cames selon une action de coin lorsque le dispositif de support est amené dans la position fermée, caractérisé en ce que les surfaces internes en forme de cames (36, 37) de l'organe formant capuchon (14) sont disposées de façon dissymétrique par rapport à l'axe longitudinal central de la glissière de guidage (10), une surface en forme de came (37) faisant, par rapport à l'axe, un angle supérieur plus important que l'autre surface en forme de came (36), les surfaces correspondantes (39, 40) situées sur la partie en forme de nez (35) de la barre (24) étant inclinées de façon correspondante.

2. Dispositif de support à friction selon la revendication 1, caractérisé en ce que la pointe (38) entre les deux surfaces inclinées en forme de cames (36, 37) situées sur l'organe formant capuchon (14) est décalée d'un côté de l'axe longitudinal central de la glissière de guidage (10), de sorte que la surface (37) inclinée sur un angle plus important par rapport à l'axe recoupe ce dernier.

3. Dispositif de support à friction selon la revendication 1 ou 2, caractérisé en ce que l'une desdites surfaces en forme de cames (36) est disposée de manière à empêcher un déplacement de la barre (24), dans une direction, au-delà de la glissière de guidage (10).

4. Dispositif de support à friction selon la revendication 3, caractérisé en ce que l'une desdites surfaces en forme de cames (36) s'étend essentiellement parallèment à l'axe longitudinal central de la glissière de guidage (10) de sorte que la fenêtre, sur laquelle le dispositif de support est monté, peut être seulement ouverte et fermée d'un côté du dispositif de support.

5. Dispositif de support à friction selon l'une quelconque des revendications 1 à 4, caractérisé en ce que la contre-fiche (16) est montée de façon à pouvoir pivoter sur un bloc (31) qui est fixé sur la glissière de guidage (10).

6. Dispositif de support à friction selon la revendication 5, caractérisé en ce que le bloc (31) est fixé à la glissière de guidage (10) par le même rivet (17) que celui qui relie, avec possibilité de rotation, la contre-fiche (16) au bloc (31).

7. Dispositif de support à friction selon la revendication 5 ou 6, caractérisé en ce que la glissière de guidage (10) possède la forme d'un profilé en U comportant des brides rentrantes (11) s'étendant le long des extrémités des parois latérales du profilé, le bloc (31) étant conformé de manière à être situé à l'intérieur dudit profilé en U et étant muni de renfoncements longitudinaux servant à recevoir lesdites brides (11).

8. Dispositif de support à friction selon l'une quelconque des revendications 5 à 8, caractérisé en ce que le bloc (31) possède un élément de surface, qui fait saillie au-dessus de la surface de la glissière de guidage de manière à former une surface de support permettant d'empêcher que les composants du dispositif de support ne butent contre la glissière de guidage (10) elle-même.

9. Dispositif de support à friction selon l'une quelconque des revendications 5 à 8, caractérisée en ce que le bloc (31) s'étend dans une large mesure sur la longueur de la glissière de guidage, au-delà de la zone du pivot (17) située entre la contre-fiche (16) et la glissière de guidage (10).

Drawing